The correct answer is (c) M.C. Marykom.
M.C. Marykom is an Indian amateur boxer who competes in the flyweight (51 kg) division. She is the only Indian woman to have won a gold medal at the World Amateur Boxing Championships, having won the title in 2006, 2008, 2010, 2012, and 2018. She is also the first Indian woman to have won a gold medal at the Asian Games, having won the title in 2010 and 2014.
Ravi Bala Charu is an Indian amateur boxer who competes in the flyweight (51 kg) division. She has won several medals at the Asian and Commonwealth Games, but has never won a world championship.
Ravi Katulu is an Indian amateur boxer who competes in the light flyweight (49 kg) division. He has won several medals at the Asian and Commonwealth Games, but has never won a world championship.
Amandeep Singh is an Indian amateur boxer who competes in the light welterweight (64 kg) division. He has won several medals at the Asian and Commonwealth Games, but has never won a world championship.